Synthesis and characterization of new bis-symmetrical adipoyl, terepthaloyl, chiral diimido-di-L-alanine diesters and chiral phthaloyl-L-alanine ester of tripropoxy p-tert-butyl calix[4]arene and study of their hosting ability for alanine and Na+

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Bis-symmetrical tripropoxy p-tert-butyl calix[4]arene esters were prepared from the reaction of tripropoxy calix[4]arene (1HPr3) with di-acyl chlorides as bridges in the presence of sodium hydride. The esters, which were synthesized from L-alanine acyl chloride derivatives, are optically active. In all of these esters, calix[4]arene cavities have a pinched cone conformation. The structures of these esters were confirmed by FT-IR, 1H NMR and 13C NMR spectroscopy, elemental analysis and ion positive FAB mass spectrometry.